<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>统计字符串中的元音子字符串</title>
</head>
<body>
  <script>
    function fn(word) {
      const len = word.length;
      if (len < 5) return 0;
      let count = 0;
      for (let i = 0; i < len; i++) {
        for (let j = i + 4; j < len; j++) {
          const arr = new Set(word.slice(i, j + 1));
          if ([...arr].sort().join('') === 'aeiou') count++;
        }
      }
      return count;
    }
    console.log(fn('aeiouu'))
  </script>
</body>
</html>